Non-transitory computer-readable storage medium, and information processing device using unique file-specific information for decryption of a target file

Abstract

A non-transitory computer-readable storage medium storing a control program that causes a computer to execute a process including receiving specified information generated in response to reception of an acquisition request of data from a terminal device that decrypts an encrypted data corresponding to the data, and identification information on the terminal device, determining whether or not the specified information is stored, in a storage unit, in association with the received identification information on the terminal device that has sent the acquisition request, the storage unit storing the specified information to be generated in association with the identification information on a terminal device for which a data acquisition is permitted for each of the plurality of pieces of data, and transmitting information that permits decryption of the encrypted data corresponding to the data to the terminal device when the specified information is stored in association with the received identification information.

What is claimed is: 
     
       1. A non-transitory computer-readable storage medium storing a control program that causes a computer to execute a process, the process comprising:
 receiving a uniform resource locator (URL) of a management terminal from a terminal device; 
 transmitting, to the terminal device, a take-out pre-request screen specifying the URL; 
 receiving specified information generated in response to reception of an acquisition request of data from the terminal device that decrypts an encrypted data corresponding to the data, and identification information on the terminal device, the specified information including a plurality of alphanumeric values that differ for each of an operation date and time of the data, the acquisition request of the data from the terminal device being received after a pre-request permission for the data is sent to the terminal device, the pre-request permission being granted by the management terminal in response to pre-request information provided by the terminal device through the take-out pre-request screen; 
 determining whether or not the specified information is stored, in a storage unit, in association with the received identification information on the terminal device that has sent the acquisition request, the storage unit storing the specified information to be generated in response to reception of a take-out operation of the data in association with the identification information on the terminal device for which a data acquisition is permitted for the data; and 
 transmitting information that permits decryption of the encrypted data corresponding to the data to the terminal device when the specified information is stored in the storage unit in association with the received identification information. 
 
     
     
       2. The non-transitory computer-readable storage medium according to  claim 1 ,
 wherein the specified information generated is different depending on the time when the acquisition request is received. 
 
     
     
       3. The non-transitory computer-readable storage medium according to  claim 1 , wherein
 the acquisition request is an instruction operation for storing specific data stored in a storage device that stores the encrypted data corresponding to the specific data in another storage device, or an instruction operation for transmitting the specific data to another information processing device. 
 
     
     
       4. The non-transitory computer-readable storage medium according to  claim 1 , wherein the process comprises:
 transmitting information that rejects decryption of the encrypted data to the terminal device when the specified information is not stored in the storage unit in association with the received identification information. 
 
     
     
       5. The non-transitory computer-readable storage medium according to  claim 1 , wherein
 a process of generating the specified information is performed every time the acquisition request is performed on the terminal device. 
 
     
     
       6. The non-transitory computer-readable storage medium according to  claim 1 , wherein
 when an acquisition request for a plurality of data is performed on the terminal device that encrypts the plurality of data collectively, a process of generating one piece of specified information in response to reception of the acquisition request for the plurality of data is performed. 
 
     
     
       7. The non-transitory computer-readable storage medium according to  claim 1 , wherein
 the plurality of alphanumeric values are randomly extracted. 
 
     
     
       8. An information processing device comprising:
 a memory; and 
 a processor coupled to the memory and the processor configured to:
 receive a uniform resource locator (URL) of a management terminal from a terminal device: 
 transmit, to the terminal device, a take-out pre-request screen specifying the URL; 
 receive specified information generated in response to reception of an acquisition request of data from the terminal device that decrypts an encrypted data corresponding to the data, and identification information on the terminal device, the specified information including a plurality of alphanumeric values that differ for each of an operation date and time of the data, the acquisition request of the data from the terminal device being received after a pre-request permission for the data is sent to the terminal device, the pre-request permission being granted by the management terminal in response to pre-request information provided by the terminal device through the take-out pre-request screen; 
 determine whether or not the specified information is stored, in a storage unit, in association with the received identification information on the terminal device that has sent the acquisition request, the storage unit storing the specified information to be generated in response to reception of a take-out operation of the data in association with the identification information on the terminal device for which a data acquisition is permitted for the data; and 
 transmit information that permits decryption of the encrypted data corresponding to the data to the terminal device when the specified information is stored in the storage unit in association with the received identification information. 
 
 
     
     
       9. A non-transitory computer-readable storage medium storing a decryption program that causes a computer to execute a process, the process comprising:
 receiving a take-out pre-request screen specifying a uniform resource locator of a server; 
 transmitting, to the server, specified information generated in response to an acquisition request of data and an identification information on a terminal device, the specified information including a plurality of alphanumeric values that differ for each of an operation date and time of the data, the acquisition request of the data occurring after a pre-request permission for the data is received from the server, the pre-request permission being granted by the server in response to pre-request information provided through the take-out pre-request screen; and 
 decrypting encrypted data corresponding to the data upon receiving information, transmitted from the server, indicating that decryption of the encrypted data is permitted.